Thomas Barois

Abstract A torsion pendulum can probe a variety of phenomena such as photon spin or gravity, uncover the properties of spider draglines or examine stochastic thermodynamics of driven systems. Here we use such a device to probe the state of an assembly of macroscopic self propelled rod-like robots, a system that is out of equilibrium and very sensitive to the surrounding boundaries.

Abstract When a fluid in turbulent motion is tagged by a nonuniform concentration of ideal tracers, the mean velocity of the tracers may not match with the mean velocity of the fluid flow. This implies that conventional particle tracking velocimetry will not produce the mean flow of a turbulent flow unless the particle seeding is homogeneous. In this work, we consider the problem of mean flow estimation from a set of particle tracks obtained in a situation of nonhomogeneous seeding.

Steering self-organisation through confinement Nuno A. M. Araújo, *ab Liesbeth M. C. Janssen, *cd Thomas Barois,e Guido Boffetta, f Itai Cohen, gh Alessandro Corbetta, c Olivier Dauchot, i Marjolein Dijkstra,j William M. Durham, k Audrey Dussutour,l Simon Garnier, m Hanneke Gelderblom, dn Ramin Golestanian, op Lucio Isa, q Gijsje H. Koenderink, r Hartmut Löwen, s Ralf Metzler, t Marco Polin, uv C.